Remove invalid source area from copy in move_region_on_impl
Remove invalid source area from copy in move_region_on_impl

There is no need to copy something that is already invalid and will
be marked as invalid in the destination anyway, so we remove this
area from the region to copy.

ebassi/gtk,msteinert/gtk,Adamovskiy/gtk,Sidnioulz/SandboxGtk,nacho/gtk-,jadahl/gtk,Adamovskiy/gtk,alexlarsson/gtk,Distrotech/gtk2,jessevdk/gtk,ebassi/gtk,Distrotech/gtk,Lyude/gtk-,davidgumberg/gtk,Sidnioulz/SandboxGtk,jessevdk/gtk,Distrotech/gtk2,simokivimaki/gtk,jigpu/gtk,Distrotech/gtk2,davidt/gtk,grubersjoe/adwaita,chipx86/gtk,davidgumberg/gtk,jigpu/gtk,Adamovskiy/gtk,jessevdk/gtk,Lyude/gtk-,Sidnioulz/SandboxGtk,Lyude/gtk-,Distrotech/gtk,alexlarsson/gtk,Distrotech/gtk2,grubersjoe/adwaita,msteinert/gtk,ahodesuka/gtk,Distrotech/gtk2,jadahl/gtk,johne53/MB3Gtk-2,Sidnioulz/SandboxGtk,jadahl/gtk,zsx/gtk,zsx/gtk,Unity-Technologies/gtk,chergert/gtk,jigpu/gtk,grubersjoe/adwaita,ebassi/gtk,nacho/gtk-,grubersjoe/adwaita,davidt/gtk,chergert/gtk,jessevdk/gtk,johne53/MB3Gtk-2,johne53/MB3Gtk-2,grubersjoe/adwaita,ahodesuka/gtk,msteinert/gtk,ahodesuka/gtk,ebassi/gtk,davidt/gtk,grubersjoe/adwaita,ebassi/gtk,chergert/gtk,chergert/gtk,bratsche/gtk-,jessevdk/gtk,ahodesuka/gtk,johne53/MB3Gtk-2,jigpu/gtk,davidgumberg/gtk,davidt/gtk,chipx86/gtk,Distrotech/gtk,Adamovskiy/gtk,grubersjoe/adwaita,chergert/gtk,bratsche/gtk-,Unity-Technologies/gtk,davidgumberg/gtk,Unity-Technologies/gtk,Adamovskiy/gtk,chergert/gtk,bratsche/gtk-,johne53/MB3Gtk-2,chipx86/gtk,simokivimaki/gtk,alexlarsson/gtk,grubersjoe/adwaita,Distrotech/gtk2,alexlarsson/gtk,simokivimaki/gtk,jadahl/gtk,alexlarsson/gtk,Adamovskiy/gtk,Adamovskiy/gtk,zsx/gtk,ahodesuka/gtk,jadahl/gtk,ebassi/gtk,msteinert/gtk,bratsche/gtk-,Lyude/gtk-,davidgumberg/gtk,chipx86/gtk,bratsche/gtk-,davidgumberg/gtk,jadahl/gtk,chergert/gtk,jigpu/gtk,Unity-Technologies/gtk,Lyude/gtk-,nacho/gtk-,Distrotech/gtk,jigpu/gtk,alexlarsson/gtk,simokivimaki/gtk,nacho/gtk-,Sidnioulz/SandboxGtk,jadahl/gtk,jessevdk/gtk,nacho/gtk-,alexlarsson/gtk,alexlarsson/gtk,davidt/gtk,Distrotech/gtk,Sidnioulz/SandboxGtk,zsx/gtk,bratsche/gtk-,zsx/gtk,msteinert/gtk,simokivimaki/gtk,jadahl/gtk,chipx86/gtk,davidgumberg/gtk,jessevdk/gtk,Lyude/gtk-,Unity-Technologies/gtk,simokivimaki/gtk,davidgumberg/gtk,ahodesuka/gtk,jigpu/gtk,jigpu/gtk,Lyude/gtk-,Lyude/gtk-,chergert/gtk,ahodesuka/gtk,msteinert/gtk,Adamovskiy/gtk,ahodesuka/gtk,davidt/gtk